Anesthesia Review

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AA/CAA board preparation

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A sample question, with the reasoning included

At steady state, one minimum alveolar concentration (MAC) is the alveolar anesthetic concentration that prevents movement in response to a standard surgical incision in what proportion of patients?

Answer choices

  • 50%
  • 95%
  • 99%
  • 90%

Correct answer: A

MAC is a population measure of anesthetic potency based on immobility to a surgical stimulus: one MAC prevents movement in 50% of subjects under the defined conditions. It is not the concentration that guarantees unconsciousness, amnesia, or immobility in every patient. Age and coadministered drugs affect anesthetic requirements.

Source

NCBI Bookshelf. Anesthesia Vaporizers. https://www.ncbi.nlm.nih.gov/books/NBK559321/